Finding the Fourth Proportional to 1,591.85, 2,196.81 and 928.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.85 : 2,196.81 = 928.60 : x
2. Step 2: Convert to fraction form
   1,591.85/2,196.81 = 928.60/x
3. Step 3: Cross multiply
   1,591.85x = 2,196.81 × 928.60
4. Step 4: Simplify right side
   1,591.85x = 2,039,957.77
5. Step 5: Solve for x
   x = 2,039,957.77/1,591.85
6. Step 6: Final answer
   x = 1,281.50